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Phys Rev Lett. 2004 Aug 20;93(8):083904. Epub 2004 Aug 19.

Kerr-nonlinearity optical parametric oscillation in an ultrahigh-Q toroid microcavity.

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California Institute of Technology, Thomas J. Watson Laboratory of Applied Physics, Pasadena, CA 91125, USA.


Kerr-nonlinearity induced optical parametric oscillation in a microcavity is reported for the first time. Geometrical control of toroid microcavities enables a transition from stimulated Raman to optical parametric-oscillation regimes. Optical parametric oscillation is observed at record low threshold levels (174 micro-Watts of launched power) more than 2 orders of magnitude lower than for optical-fiber-based optical parametric oscillation. In addition to their microscopic size (typically tens of microns), these oscillators are wafer based, exhibit high conversion efficiency (36%), and are operating in a highly ideal "two photon" emission regime, with near-unity (0.97+/-0.03) idler-to-signal ratio.

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